\begin{tikzpicture}[
    >=Stealth,
    skip loop/.style={to path={-- ++(#1, 0) |- (\tikztotarget)}},
]
    \graph [grow down sep = 2em,
        nodes={draw, rectangle, minimum width=7em},
        decision/.style={draw, diamond, aspect=4, inner sep=1pt},
    ]{
        add/"$+3$" [label=above:{输入}] ->
        times/"$\times (+3)$" ->
        sub/"$- (-5)$" ->
        decide/"$>200$" [decision, label=3:{否}] ->["是"]
        stop/"停" [label=below:{输出}];
    };

    \graph[no placement] {
        p1 [coordinate, below=3mm of add];
        (decide.east) -> [skip loop=10mm] (p1);
    };
\end{tikzpicture}
